A conic section which is essentially a stretchedcircle.

Formally, an ellipse can be defined as follows: For two given points, the foci, an ellipse is the locus of points such that the sum of the distance to each focus is constant. The standard form for the equation of an ellipse is given below.




Movie clip

Ellipse: Sum of distances
from the foci is constant



See also

Focus, focal radius, directrices of an ellipse, area of an ellipse, hyperbola

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